ソーダ石灰ガラスのサブクリティカルなき裂成長に及ぼす環境および多軸応力の影響 : 定負荷速度試験による検討

概要

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The constant stressing rate tests of Soda-Lime glass specimens having a controlled surface flaw introduced by Vickers microhardness indentation were conducted by four-point bending of plates (uniaxial stressing) and by concentric ring loading of disks (equibiaxial stressing) under different environments of vacuum, air, and ion exchanged water. The fracture strength at a certain stressing rate became almost greater in the order of water<air <vacuum, and vacuum showed little stressing rate dependence. In both air and water environments, the parameters n for subcritical crack growth were obtained from the stressing rate dependence of the fracture strength. The biaxial stress effects were exhibited only in water, with a slightly lower n value and apparently higher strength observed. Furthermore, the n value in water was higher than that in air, and this behavior was explained by taking the change by stressing rate in the radius of the crack tip blunted in water into consideration.
社団法人日本機械学会の論文
1989-01-25